radium emanation

noun

, Chemistry.

1. (formerly) radon.

Word History and Origins

Origin of radium emanation¹

First recorded in 1900–05

Example Sentences

One gram of radium has been settled upon as the standard for that series and a unit known as the "curie" has been adopted to express the equilibrium quantity of radium emanation.

From Project Gutenberg

A large quantity of radium emanation was compressed into a fine glass tube A, about 1.5 cm. long.

From Project Gutenberg

Radium then expels an alpha particle and becomes the gas, radium emanation, which is an analogue of argon and belongs to the zero group.

From Project Gutenberg

The name radium emanation was given to the latter and it was found chemically and physically to belong to the class of monatomic or noble gases, such as helium, argon, neon, etc., which had been discovered by Ramsay.

From Project Gutenberg

These are generally known as radium emanation, thorium emanation, and actinium emanation.

From Project Gutenberg